What kind of meat is in a BiFi?

I'm curious, could you please elaborate on what kind of meat might be found in a "BiFi"? Is this a reference to a specific dish or culinary creation? Or perhaps it's a play on words that I'm not familiar with? I'm eager to understand the context and meaning behind this phrase, as it's not immediately clear to me what "BiFi" entails, especially in relation to meat. Thank you for your clarification.